Lock.



A. F. W. VIEHWEGER.

LOCK.

APPLICATION FILED MAY26.1916. v 1 ,1 99,639. v Patented Sept. 26,1916.

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rran sra'ras PATENT W AUGUST F. W.v VIEHWEGER, OF I-IOBOKEN, NEW JERSEY.

LOCK.

Specification of Letters Patent.

Original application filed April 7, 1916, Serial No. 89,607. Divided andthis application filed May 26, 1916.

Serial No. 100,068.

To all whom it may concern Be it known that I, AUGUs'r F. W. VIEH-WEGER, a subject of the Emperor of Germany, residingat Hoboken, in thecounty of Hudson and State of New Jersey, have invented certain newcanduseful Improvements in Locks; and I do hereby declare the following tobe a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

The invention relates to improvements in looks and the presentapplication is a division of an application filed by me April 7, 1916,Serial No. 89,607.

The object of the present invention is to improve the construction oflocks and latches and to provide a simple, practical and comparativelyinexpensive lock adapted to be readily applied to doors and equippedwith means for securely latching the bolt in an extended or engagingposition to prevent he same from being retracted by a key.

With these and other objects in view, the invention consists in theconstruction and novel combination of parts hereinafter fully described,illustrated in the accompanying drawings, and pointed out in the claimshereto appended; it being understood that various changes in the form,proportion, size and minor details of construction, within the scope ofthe claims, may be resorted to without departing from the spirit orsacrificing any of the advantages of the invention.

In the drawing Figure 1 is a vertical longitudinal sectional view of alock constructed in accordance with this invention, Fig. 2 is atransverse sectional' view on the line 22 of Fig. 1, Figs. 3 and 4 aredetail perspective views of the latch bolt, Fig. 5 is a detail view ofthe hub member. of the knob for actuating the bolt from the-interior,Fig. 6 is a detail view of the key.

Like numerals of reference designate corresponding parts in-theseveral'figures of the drawing.

In the accompanying drawing in which is illustrated the preferredembodiment of the invention, the lock or latch comprises in itsconstruction a slidable bolt 1 mounted in a casing 2 and adapted toproject from one end thereof through an opening 3 for engaging asuitable keeper, not shown. The lock casing which may be of any desiredconstruction is preferably provided with a removable face plate 4 havinga flange 5 designed to be arranged in a suitable mortise or recess attheedge of the door. The bolt is provided at its rear portion with alongitudinal slot 5 'in which extends 'a horizontally disposedsupporting and guiding arm 6 having an attaching portion 7 which issuitably secured to the rear wall of the lock casing as clearlyillustrated in Fig. 2 of the drawings. The bolt is provided at the innerside with upper and lower shoulders 8 which are adapted to be engaged bya hub member 9 pivoted intermediate of its ends to a spindle 10 of aknob 11 located at the inner face of the door, not shown, and adapted tobe turned to cause the hub'member to engage one or the other of theupper and lower shoulders 8 for retracting the slidable bolt 1 againstthe action of a coiled spring 12. The coiled spring 12 which is securedat its casing is connected at its forward end to the upper arm ofaninclined lever 13 fulcrumed intermediate of its ends on a pivot let andhaving in its lower arm a slot 15 for the reception of a suitable pivot16 that is carried by the bolt. The pivot 16 which may consist of ascrew is mounted in an opening 17 of the slidable bolt which is normallymainrear end to the upper portion ofthe lock tained in an extendedposition by the spring 7 12. The pivot 14 of the lever 13 has alsomounted on it a catch 18 extending upwardly and forwardly from the pivot14: and consisting of an arm provided with a lower engaging portion ortooth 19 and normally supported in an elevated position with the saidtooth 19 out of engagement with a recess 20 of the bolt by a leaf springor plate spring 21. w The spring 21 is secured at its rear end to theupper wall of the lock casing and the forward end is connected with thefront portion of the arm of the catch as clearly illustrated in Fig. 4of the drawing. The catch may consist of a single piece of sheet metalbent to form the tooth or engaging portion and a flange 22 which engagesthe front end of the spring 21. The notch or recess 20 is formed in theupper edge of the slidable bolt at the front portion thereof and it islocated below the tooth or a knob 35.

engaging portion of the catch when the bolt is in its extended position.The catch is adapted to be depressed and maintained in engagement withthe recess 20 by an operating device 23.

The operating device 23 consists of a head and a stem 24 provided withprojecting lugs 25 adapted to extend through slots 26 in the top wall ofthe casing so that the operating device 23 may be depressed andpartially rotated to force the catch into engagement with the latch boltand lock the catch in such engagement. This will effectually prevent thebolt from being retracted or operated from the exterior.

The slid-able bolt is provided in its lower portion with a recess 27forming a shoulder 28 and adapted to receive the engaging portions 29 ofa key 30 for enabling the key to engage the shoulder 28 and retract thebolt. The key is provided with spaced bits 31 which may be arranged in avariety of ways which are also adapted to pass through recesses 32 of aslidable contact member 33 preferably consisting of an arched piece ofmetal which is connected at a point intermediate of its ends to a stemor shank 3st of The stem or shank 34: extends through a slot 36 in thelower wall of the latch casing and it is adapted to be engaged by a keyand to be moved into electrical engagement or contact with a fixedcontact member 37. The lock casing is provided at the outer side with akey hole 38 for the introduction of a key in the usual manner and anyattempt to pick the lock with an ordinary key or pick will result inmoving the contact member 33 into engagement with the contact member 37.This will operate to close the circuit which may be equipped with anysuitable signal not shown, as set forth in the aforesaid application.The

, contact member 37 is mounted on the stem or screw 39 of a binding post4% with which a wire 45 is connected. The lock casing is also providedwith a binding post 40 having a wire 41 connected to it. The bindingpost 44 with which the contact 37 is con nected is insulated from thelock casing not shown.

No claim is made in the present application to the circuit closing meansas this of the lever and a catch mounted on the pivot of the lever andarranged to engage the bolt for locking the same in its extendedposition. 7

2. A lock of the class described including a slidable'bolt, a leverfulcrumed intermediate of its ends and arranged at an inclination, itslowerarm being provided with a slot, a spring connected with the upperarm of the lever, a pivot mounted on the bolt and operating in the slotof the lower arm of the lever and a catch mounted on the pivot of thelever and having an engaging portion arranged to hold the bolt in itsextended position, a spring for normally supporting the catch in anelevated position out of engagement with the bolt and an exteriorlyoperable device provided with means for forcing the catch intoengagement with the bolt and for locking the catch in such engagement.

3. A lock of the class described including a slidable bolt, provided inits upper edge with a recess, a pivoted catch having a dependingengaging portion arranged to extend intovthe said recess, a springconnected with the catch for supporting the same in an elevated positionand an exteriorly operable device consisting of a stem or shankextending through the lock casing and ar ranged to depress the catch,said lock casing having opposite slots and the device being providedwith projections adapted to pass through the slots and to be turned outof alinement with the same for holding the catch in its engagingposition.

In testimony whereof I aflix my signature in presence of two witnesses.

AUGUST F. W. VIEHWEGER.

Witnesses CHARLES FAIsT, THORVALD BALSLOW.

Gopies of tibia patent may be obtained for five cents each, byaddressing the "Oosioner of flatento, Washington, D. C.

